(19)
(11) EP 0 585 867 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
17.08.1994 Bulletin 1994/33

(43) Date of publication A2:
09.03.1994 Bulletin 1994/10

(21) Application number: 93113884.6

(22) Date of filing: 31.08.1993
(51) International Patent Classification (IPC)5: G02B 3/06, G02B 26/10, G02B 27/00, G02B 5/08
(84) Designated Contracting States:
DE FR GB NL

(30) Priority: 01.09.1992 JP 233390/92

(71) Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
Kadoma-shi, Osaka-fu, 571 (JP)

(72) Inventors:
  • Yoshikawa, Motonobu
    Osaka-shi, Osaka (JP)
  • Yamamoto, Yoshiharu
    Toyonaka-shi, Osaka (JP)

(74) Representative: Eisenführ, Speiser & Partner 
Martinistrasse 24
28195 Bremen
28195 Bremen (DE)


(56) References cited: : 
   
       


    (54) Anamorphic single lens for use in an optical scanner


    (57) An anamorphic single lens with its radii in respective directions determined by the transfer efficiency of beams and imaging positions in respective directions, as required by the overall optical scanner, the anamorphic single lens satisfying the following formulae:


    where fm is the focal length of the lens in the direction of beams diverged at a larger angle, TH is the thickness, S is the distance from a light source side principal point position (6) to the light source (5) in the direction of the beams diverged at the larger angle, and S' is the distance from a light source side principal point position (8) to the light source in the direction of beams diverged at a smaller angle.






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